Cook the apples with the sugar, the cinnamon and
the lemon rind in a little bit of water until they are soft, then puree
in the food processor. Cool down for a few hours in the fridge. Beat
the egg whites for 5 minutes and mix with the apple sauce. Put in the
freezer for at least four hours; stir every hour; or use an electrical
ice cream maker.
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apple ice cream recipe.